List conditions under which combustion can take place.
Combustion is a process of reaction of a substance with oxygen. There are certain conditions required for combustion to take place. They are:
(i) Presence of a fuel
(ii) Air (or oxygen)
(iii) Ignition temperature (minimum temperature at which a substance catches fire)
Give reasons.
(a) Water is not used to control fires involving electrical equipment.
(b) LPG is a better domestic fuel than wood.
(c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.